Grid Painting

Grid Painting

The mission is in Blocked Mode. Access to the solutions is blocked for a day or two (even after you share your own), until we'll have enough solutions for you to check. All users who've solved the mission will get the notifications about their opening.

This mission paints designated cells in a 5x5 grid with a brush. And return its minimum number of steps.

  • Each cell is assigned a letter of the alphabet from A to Y (Row-major order). Use this as input value.
  • You can paint vertically (or horizontally) consecutive cells with any width brush at a time.


  • Don't paint undesignated cells.
  • The cell may be painted multiple times.


Input: Designated cells (str).

Output: Minimum number of steps (int).


assert grid_painting("ABCFGHMRX") == 3
assert grid_painting("GHLMNRS") == 2
assert grid_painting("GHILNQRS") == 4
Invalid hot key. Each hot key should be unique and valid
Hot keys:
CheckiO Extensions

CheckiO Extensions allow you to use local files to solve missions. More info in a blog post.

In order to install CheckiO client you'll need installed Python (version at least 3.8)

Install CheckiO Client first:

pip3 install checkio_client

Configure your tool

checkio --domain=py config --key=

Sync solutions into your local folder

checkio sync

(in beta testing) Launch local server so your browser can use it and sync solution between local file end extension on the fly. (doesn't work for safari)

checkio serv -d

Alternatevly, you can install Chrome extension or FF addon

checkio install-plugin
checkio install-plugin --ff
checkio install-plugin --chromium

Read more here about other functionality that the checkio client provides. Feel free to submit an issue in case of any difficulties.

<< <
> >>
exec show

Whats Next?

Free accounts will see Best CheckiO solutions with some delay.
Best Solutions will be opened in a moment
Become Awesome and Don't wait
The next stage is ""
Will be activated in
View More Solutions Random Review Solutions Go to the next mission